Not sure where to get that from but I use http://www.wowhead.com/item=86125 very nice mid fight with holy avenger and high veng.I use a strength pot pre fight as I'll be at low veng, the only real, problem with the Kafa is it's a 10 min cd so depending on what fight you're progressing on you'll only get to use it every other attempt.If it'll beat a strength pot for dps will completely depend on your veng level if I remember Theck's graphs right at 100k veng haste easily beats strength not sure on the break point though.

Daishan"I'll be more enthusiastic about encouraging thinking outside the box when there's evidence of any thinking going on inside it." -- Terry Pratchett

Get the kafa from a cave in kun lei with yetis in, the wowhead link comments section should have coordinates. The root 1 min cd would allow you to pre pot with it and use mid fight, but it'll be the same as pots in that it gets locked out after the first in combat use. Good luck getting the Kafa

Edit: wowhead comment" I finally found it, the frozen NPC is called Frozen Trail Packer , I uploaded a ss at his page to show what to look for, just go to the bottom of the westmost yeti cave (entrance at 37.5, 78.0 into the slightly larger room and he's on the other side of the little frozen river right in front of you when you enter the room, exact coord of the ice block are35.2, 76.3 He can be manually added to NPCscan for an easier check just by flying over the cave without going inside, his ID is 64227 P.S. and no, it is not related to Lost Adventurer's Belongings , it's another treasure"

Daishan"I'll be more enthusiastic about encouraging thinking outside the box when there's evidence of any thinking going on inside it." -- Terry Pratchett